Good evening, i have Archer C80 by TP-link, so and there isn't any version for my device. What should i download?
Don’t download anything - every image of OpenWrt that targets integrated WiFi router devices is bespoke. If your device is not listed, it is not supported by OpenWrt. Installing the image for another device will likely brick yours.
Absence of gpl source and <4MB upgrade file signifies that device runs vxworks and is too small for linux.
Will be there version for my device?
Nope.
If router has 4MB flash - NO
If router has 8MB flash unlikely to stay supported due to short space in next OpenWRT release if it somehow is a linux supported SoC and you spend months writing support bits.